- Do a "cabal build" to resolve any dependencies. If that fails, try installing the Gloss framework "cabal install gloss". Everything else should be included by default in GHC.
- "cabal run" does the trick. I don't advise you to run it via GHCI, because it usually impedes performance.
- The coolest way to use it is to press random (6) and look at the cool stuff being generated.
- Otherwise, you could select a preset, which I have somewhat carefully chosen.

I've been playing with the random for hours now. Be careful!